﻿//宏常量 #define 常量名 值
#include <iostream>

#define MOUNTHS 12
#define PI                 3.14115926
using namespace std;

int main()
{
	const int days = 7;
	cout << "一个星期有：" << days << "天" << endl;
	cout << "一年有" << MOUNTHS << "个月" << endl;
	cout << "圆周率的值是：" << PI << endl;
}

